Cockpit is pivotal for aircraft to operate safely and efficiently. The rational design of its digital information interface can improve the pilots' situational awareness level to manage the digital information and make decision in flight, reduce artificial errors and improve flight safety. By reviewing the research of digital information interface design of Primary Flight Display (PFD), Head Mounted Display (HMD), and Panoramic Cockpit Display (PCD) in existing civil aircraft and warcraft cockpits, the development law and trend on human-machine interaction design of cockpit are summarized. It's indicated in domestic and foreign literature reviews that the human-machine communication and cooperation, the pilots' efficiency of obtaining aircraft information and making decision, and the flight quality can be improved by representation design of digital information interface of machine and research on situational awareness, cognitive efficiency and cognitive experience.